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Cast Iron : Balustrade, Baluster, Newel Post In the 19th century cast iron was an important component of staircase, whether whole in whole or just the the newel posts.
Wrought iron railing and standards
Architectural iron and steel : and its applicat...
see site - Materials and documents of architecture and sculpture : classified alphabetically -- Published 1915
Stair Railing Designs ISR103
Wrought iron pedestrian gate, with side panels, railing and standards
Wrought iron stoop and area railing and newel posts.